Camera module including a housing with an adhesion surface

ABSTRACT

One embodiment relates to a camera module comprising: a housing; a first printed circuit board having an image sensor mounted thereon, and loaded in the housing such that the image sensor is accommodated in the housing; a second printed circuit board and a third printed circuit board sequentially arranged on the lower part of the first printed circuit board in the vertical direction; a support unit arranged in the housing while accommodating the first printed circuit board therein, and having a stepped portion including a first loading portion at which the second printed circuit board is placed and a second loading portion at which the third printed circuit board is placed; and a fixing unit coupled to the housing by penetrating through a first groove portion and a second groove portion, which are respectively formed at the edge parts of the second printed circuit board and the third printed circuit board, and through a third groove portion formed at the edge part of the support unit.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.16/781,414, filed Feb. 4, 2020; which is a continuation of U.S.application Ser. No. 15/770,436, filed Apr. 23, 2018, now U.S. Pat. No.10,594,907, issued Mar. 17, 2020; which is the U.S. national stageapplication of International Patent Application No. PCT/KR2016/011871,filed Oct. 21, 2016, which claims priority to Korean Application No.10-2015-0146617, filed Oct. 21, 2015, the disclosures of each of whichare incorporated herein by reference in their entirety.

TECHNICAL FIELD

Embodiments relate to a camera module.

BACKGROUND ART

In recent vehicle technology, a system making it possible to check theleft and right sides and the front and rear of a vehicle through adisplay disposed in a dashboard of the vehicle using images captured bysmall-sized cameras installed at the front and rear parts of the vehicleas well as the left and right parts of the vehicle for safe driving hasbeen used, or small-sized cameras have been utilized at various placesfor various purposes in order to check images of the surroundings inreal time. In the full-scale utilization of cameras, the quality ofimages captured by the cameras is very important in evaluating theperformance of the cameras. Cameras that have been used in recent yearshave circuit-related problems, such as data compression, powerconsumption, and limited internal memory, and camera module-relatedproblems, such as difficulty in optical zooming, the use of low-passoptical filters, low-quality reproduction of colors, and limitedresolution. As a result, the quality of images captured by such camerasis lower than the quality of images captured by dedicated digitalcameras.

The overall quality of an image is determined based on an image chaincomprising an input module, an image processing module, and an outputmodule. In particular, the quality of the image is greatly affected bythe characteristics of the input module, such as a camera.

A conventional camera module includes a printed circuit board, an imagesensor mounted on the printed circuit board, a housing for receiving theimage sensor mounted on the printed circuit board, and a lens barrelcoupled to the housing so as to be located above the image sensor. Theimage sensor and a lens mounted in the lens barrel are aligned with eachother based on the optical axis of the lens. Subsequently, the housingand the lens barrel are assembled and fixed to each other using anadhesive. In addition, the housing and the printed circuit board areassembled and fixed to each other using an adhesive. A plurality ofprinted circuit boards, including a printed circuit board for supplyingpower to the printed circuit board having the image sensor mountedthereon, may be further disposed on the printed circuit board having theimage sensor mounted thereon.

In the case in which the plurality of printed circuit boards isconnected to the printed circuit board having the image sensor mountedthereon, however, the printed circuit board having the image sensormounted thereon may be physically stressed by the plurality of printedcircuit boards disposed on the printed circuit board having the imagesensor mounted thereon.

DISCLOSURE Technical Problem

Embodiments provide a camera module configured such that a plurality ofprinted circuit boards is arranged in a housing so as to be spaced apartfrom each other by a predetermined distance.

Technical Solution

In one embodiment, a camera module includes a housing, a first printedcircuit board having an image sensor mounted thereon, the first printedcircuit board being located in the housing such that the image sensor isreceived in the housing, a second printed circuit board and a thirdprinted circuit board sequentially disposed under the first printedcircuit board in a vertical direction, a support unit disposed in thehousing while receiving the first printed circuit board, the supportunit being provided with a stair portion including a first locationportion, on which the second printed circuit board is located, and asecond location portion, on which the third printed circuit board islocated, and a fixing unit coupled to the housing through a first recessand a second recess formed in corners of the second printed circuitboard and the third printed circuit board, respectively, and through athird recess formed in a corner of the support unit.

An adhesion surface may be disposed in the housing in a protruding stateso as to contact an edge of the first printed circuit board.

A concave and convex portion may be formed on the adhesion surface.

A plurality of first coupling protrusions may be disposed on one surfaceof the support unit that contacts the housing, and first couplingrecesses may be disposed in the housing so as to correspond to the firstcoupling protrusions such that the first coupling protrusions areinserted into the first coupling recesses.

A plurality of second coupling protrusions may be disposed on the othersurface of the support unit that contacts the second printed circuitboard, and coupling holes may be disposed in the second printed circuitboard so as to correspond to the second coupling protrusions such thatthe second coupling protrusions are inserted into the coupling holes.

The fixing unit may include a first fixing unit, extending through thefirst recess of the second printed circuit board and the third recess ofthe support unit, and a second fixing unit, extending through the secondrecess of the third printed circuit board and the third recess of thesupport unit.

A second coupling recess may be disposed in the housing so as tocorrespond to the third recess.

A first protruding portion, which contacts the first recess of thesecond printed circuit board, may be disposed on one end of the firstfixing unit, and a first screw thread, which is screw-engaged into thesecond coupling recess of the housing, may be disposed on the other endof the first fixing unit.

A second protruding portion, which contacts the second recess of thethird printed circuit board, may be disposed on one end of the secondfixing unit, and a second screw thread, which is screw-engaged into thesecond coupling recess of the housing, may be disposed on the other endof the second fixing unit.

A fitting recess may be disposed in an edge of the third printed circuitboard that contacts the support unit.

A fitting protrusion configured to be coupled into the fitting recessmay be disposed in the support unit.

In another embodiment, a camera module includes a housing, a firstprinted circuit board having an image sensor mounted thereon, the firstprinted circuit board being located in the housing such that the imagesensor is received in the housing, a second printed circuit board and athird printed circuit board sequentially disposed under the firstprinted circuit board in a vertical direction, a support unit disposedin the housing while receiving the first printed circuit board, thesupport unit being provided with a stair portion including a firstlocation portion, on which the second printed circuit board is located,and a second location portion, on which the third printed circuit boardis located, and a fixing unit coupled to the housing through a firstrecess and a second recess formed in corners of the second printedcircuit board and the third printed circuit board, respectively, andthrough a third recess formed in a corner of the support unit, whereinthe sectional area of the first printed circuit board is configured soas to be smaller than the sectional area of the second printed circuitboard and the sectional area of the third printed circuit board.

A plurality of first coupling protrusions may be disposed on one surfaceof the support unit that contacts the housing, and first couplingrecesses may be disposed in the housing so as to correspond to the firstcoupling protrusions such that the first coupling protrusions areinserted into the first coupling recesses.

A plurality of second coupling protrusions may be disposed on the othersurface of the support unit that contacts the second printed circuitboard, and coupling holes may be disposed in the second printed circuitboard so as to correspond to the second coupling protrusions such thatthe second coupling protrusions are inserted into the coupling holes.

The fixing unit may include a first fixing unit, extending through thefirst recess of the second printed circuit board and the third recess ofthe support unit, and a second fixing unit, extending through the secondrecess of the third printed circuit board and the third recess of thesupport unit.

A second coupling recess may be disposed in the housing so as tocorrespond to the third recess.

A first protruding portion, which contacts the first recess of thesecond printed circuit board, may be disposed on one end of the firstfixing unit, and a first screw thread, which is screw-engaged into thesecond coupling recess of the housing, may be disposed on the other endof the first fixing unit.

A second protruding portion, which contacts the second recess of thethird printed circuit board, may be disposed on one end of the secondfixing unit, and a second screw thread, which is screw-engaged into thesecond coupling recess of the housing, may be disposed on the other endof the second fixing unit.

In a further embodiment, a camera module includes a housing, a firstprinted circuit board having an image sensor mounted thereon, the firstprinted circuit board being located in the housing such that the imagesensor is received in the housing, a second printed circuit board and athird printed circuit board sequentially disposed under the firstprinted circuit board in a vertical direction, a support unit disposedin the housing while receiving the first printed circuit board, thesupport unit being provided with a stair portion including a firstlocation portion, on which the second printed circuit board is located,and a second location portion, on which the third printed circuit boardis located, and a fixing unit coupled to the housing through a firstrecess and a second recess formed in corners of the second printedcircuit board and the third printed circuit board, respectively, andthrough a third recess formed in a corner of the support unit, whereinan adhesion surface is disposed in the housing in a protruding state soas to contact an edge of the first printed circuit board.

A concave and convex portion may be formed on the adhesion surface.

Advantageous Effects

In the embodiments described above, a plurality of printed circuitboards is disposed in a housing so as to be e spaced apart from eachother. As a result, the printed circuit boards are not physicallystressed, whereby a printed circuit board having an image sensor mountedthereon is not deformed or dislocated. Consequently, it is possible toacquire a captured image without distortion.

DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view showing a camera module according to anembodiment;

FIG. 2 is an exploded perspective view showing the camera moduleaccording to the embodiment;

FIG. 3 is a plan view showing a housing of the camera module accordingto the embodiment;

FIG. 4 is an exploded perspective view showing the coupling relationshipbetween the housing, a support unit, and printed circuit boards of thecamera module according to the embodiment;

FIG. 5 is a plan view showing a second printed circuit board of thecamera module according to the embodiment;

FIG. 6 is a plan view showing a third printed circuit board of thecamera module according to the embodiment; and

FIG. 7 is a perspective view showing the bottom surface of the cameramodule according to the embodiment.

BEST MODE

Reference will now be made in detail to embodiments, examples of whichare illustrated in the accompanying drawings.

In the following description of the embodiments, it will be understoodthat, when each element is referred to as being “on” or “under” anotherelement, it can be “directly” on or under another element, or can be“indirectly” disposed in relation thereto such that an interveningelement is present therebetween. In addition, when an element isreferred to as being “on” or ‘under,” “under the element” as well as “onthe element” can be included based on the element.

In the drawings, the thicknesses or sizes of respective layers may beexaggerated, omitted, or schematically shown for convenience and clarityof description. Further, the sizes of the respective elements may notdenote the actual sizes thereof.

FIG. 1 is a perspective view showing a camera module according to anembodiment, and FIG. 2 is an exploded perspective view showing thecamera module according to the embodiment.

Referring to FIGS. 1 and 2 , a camera module 10 according to thisembodiment includes a housing 100, a first printed circuit board 200having an image sensor mounted thereon, a second printed circuit board300 and a third printed circuit board 400 disposed under the firstprinted circuit board 200, a support unit 500 in which the secondprinted circuit board 300 and the third printed circuit board 400 arelocated, and a fixing unit 600 for fixing the second printed circuitboard 300 and the third printed circuit board 400 located in the supportunit 500.

The housing 100 is provided with a through hole 140, which is formed inthe vertical direction. A lens barrel 700 is coupled into the upper partof the through hole 140. Consequently, the inner diameter of the throughhole 140 may be formed so as to correspond to the outer diameter of thelens barrel 700.

At least one lens may be disposed in the lens barrel 700. Alternatively,a plurality of lenses may be arranged in the lens barrel in the state ofbeing stacked so as to be spaced apart from each other by apredetermined distance.

Meanwhile, a cover glass for protecting the lens may be further disposedat the upper end of the lens barrel 700.

In addition, the first printed circuit board 200 may be disposed in thehousing 100, and an image sensor 210 may be mounted on the first printedcircuit board 200. The first printed circuit board 200 may be located inthe housing 100 such that the image sensor 210 is received in thethrough hole 140 of the housing 100 while facing the lens barrel 700.

The image sensor 210, which condenses incident light in order togenerate an image signal, may be a complementary metal-oxidesemiconductor (CMOS) sensor or a charge-coupled device (CCD) sensor.

Meanwhile, the support unit 500, a description of which will follow, maybe disposed in the housing 100 so as to receive the first printedcircuit board 200. The second printed circuit board 300 and the thirdprinted circuit board 400 may be located in the support unit 500 so asto be disposed under the first printed circuit board 200 in the state ofbeing successively spaced apart from each other in the verticaldirection.

Conventionally, when a plurality of printed circuit boards is disposedunder a first printed circuit board having an image sensor mountedthereon, the plurality of printed circuit boards is disposed so as to beconnected to the first printed circuit board in the vertical direction.In this structure, the weight of the plurality of printed circuit boardsconnected to the first printed circuit board is applied to the firstprinted circuit board. Due to such physical stress, the first printedcircuit board is deformed or tilted, whereby the first printed circuitboard is dislocated. As a result, an image acquired by the camera moduleis distorted.

In this embodiment, the sectional area of the first printed circuitboard 200 may be configured so as to be smaller than the sectional areaof the second printed circuit board 300 and the sectional area of thethird printed circuit board 400 such that the first printed circuitboard 200 is located in the housing 100. In addition, the support unit500, in which the second printed circuit board 300 and the third printedcircuit board 400 are located, may be disposed so as to receive thefirst printed circuit board 200. As a result, the second printed circuitboard 300 and the third printed circuit board 400 may be disposed underthe first printed circuit board 200 without direct connection with thefirst printed circuit board 200.

FIG. 3 is a plan view showing the housing of the camera module accordingto the embodiment, FIG. 4 is an exploded perspective view showing thecoupling relationship between the housing, the support unit, and theprinted circuit boards of the camera module according to the embodiment,FIG. 5 is a plan view showing the second printed circuit board of thecamera module according to the embodiment, FIG. 6 is a plan view showingthe third printed circuit board of the camera module according to theembodiment, and FIG. 7 is a perspective view showing the bottom surfaceof the camera module according to the embodiment.

Referring to FIGS. 3 and 4 , an adhesion surface 110 may be disposed inthe housing 100 so as to contact the edge of the first printed circuitboard 200.

In addition, an adhesion member (not shown) may be disposed between theadhesion surface 110 and the first printed circuit board 200. Theadhesion member (not shown) may be a liquid-phase adhesive, to whichultraviolet rays are irradiated so as to solidify the adhesive within ashort time through the reaction of an optical initiator contained in theadhesive, i.e. a UV hardening adhesive. However, the disclosure is notlimited thereto.

Besides, the adhesion surface 110 may protrude to a predetermined heightsuch that the adhesion member (not shown) is disposed only between theadhesion surface 110 and the edge of the first printed circuit board200, whereby the adhesion member is inhibited from spreading out to thelower end surface of the housing, excluding the adhesion surface 110.

If the width of the adhesion surface 110 is too small, the adhesionforce between the adhesion surface and the first printed circuit board200 may be reduced. If the width of the adhesion surface 110 is toolarge, the adhesion surface 110 may contact a circuit of the firstprinted circuit board 200. Consequently, the width of the adhesionsurface 110 may be set in consideration of the size and structure of thefirst printed circuit board 200.

In addition, a concave and convex portion 111 for increasing theadhesion force of the adhesion member (not shown) may be formed on theadhesion surface.

Referring to FIGS. 4 to 7 , the support unit 500 may be disposed in thehousing 100 so as to receive the first printed circuit board 200. Inaddition, the support unit 500 may be provided with a stair portionincluding a first location portion 510, on which the second printedcircuit board 300 is located, and a second location portion 520, onwhich the third printed circuit board 400 is located, such that thesecond printed circuit board 300 and the third printed circuit board 400are spaced apart from each other in the vertical direction.

The edge of the second printed circuit board 300 may be located on thefirst location portion 510, and the edge of the third printed circuitboard 400 may be located on the second location portion 520.

A plurality of first coupling protrusions 540 may be disposed on onesurface of the support unit 500 that contacts the housing 100.

In addition, first coupling recesses 120 may be disposed in the housing100 so as to correspond to the first coupling protrusions 540. The firstcoupling protrusions 540 may be inserted into the first couplingrecesses 120 such that the support unit 500 is fixed to the housing 100.

Besides, the distal end of each of the first coupling protrusions 540may be inclined or curved such that the first coupling protrusions 540can be easily inserted into the first coupling recesses 120.

In this embodiment, a first coupling protrusion 540 is disposed at eachof diagonally facing corners of one surface of the support unit 500, andthe first coupling recesses 120 are disposed in the housing 100 so as tocorrespond to the first coupling protrusions 540. However, the number orshape of the first coupling protrusions and the first coupling recessesis not limited thereto, as long as the first coupling protrusions andthe first coupling recesses can fix the support unit 500 to the housing100.

As described above, after the support unit 500 is coupled and fixed tothe housing 100, the second printed circuit board 300 may be disposed soas to be spaced apart from the first printed circuit board 200, and thesecond printed circuit board 300 may be disposed so as to be spacedapart from the third printed circuit board 400.

In addition, a plurality of second coupling protrusions 550 may bedisposed on the other surface of the support unit 500 that contacts thesecond printed circuit board 300, and coupling holes 320 may be disposedin the second printed circuit board 300 so as to correspond to thesecond coupling protrusions 550.

The height of each of the second coupling protrusions 550 may be set soas to be equal to the thickness of the second printed circuit board 300.

In this embodiment, a second coupling protrusion 550 is disposed at eachof diagonally facing corners of the other surface of the support unit500, and the coupling holes 320 may be disposed in the second printedcircuit board 300 so as to correspond to the second coupling protrusions550. When the second printed circuit board 300 is located in the supportunit 500, therefore, the second coupling protrusions 550 are insertedinto the coupling holes 320, whereby the second printed circuit board300 may be fixed to the support unit 500. However, the structure bywhich the second printed circuit board 300 is fixed to the support unit500 is not limited thereto.

A first recess 310 a, 310 b, 310 c, and 310 d may be formed in outercorners of the second printed circuit board 300 in the thicknessdirection of the second printed circuit board 300, and a second recess410 a and 410 b may be formed in outer corners of the third printedcircuit board 400 in the thickness direction of the third printedcircuit board 400. In addition, a third recess 530 a, 530 b, 530 c, and530 d may be formed in outer corners of the support unit 500 in theheight direction of the support unit 500.

Referring to FIGS. 2 to 7 , the fixing unit 600 may be formed in theshape of a cylindrical bar, and may be coupled to the housing 100through the first recess 310 a, 310 b, 310 c, and 310 d, the secondrecess 410 a and 410 b, and the third recess 530 a, 530 b, 530 c, and530 d.

More specifically, the fixing unit 600 may include a first fixing unit610, extending through the first recess 310 a and 310 b of the secondprinted circuit board 300 and the third recess 530 a and 530 b of thesupport unit 500, and a second fixing unit 620, extending through thesecond recess 410 a and 410 b of the third printed circuit board 400 andthe third recess 530 c and 530 d of the support unit 500.

Second coupling recesses 130 may be disposed in the housing 100 so as tocorrespond to the third recess 530 a, 530 b, 530 c, and 530 d such thatthe first fixing unit 610 and the second fixing unit 620 are coupled andfixed into the second coupling recesses 130.

In addition, the first recess 310 a and 310 b may include a 1-1 recess310 a and a 1-2 recess 310 b, the second recess 410 a and 410 b mayinclude a 2-1 recess 410 a and a 2-2 recess 410 b, and the third recess530 a, 530 b, 530 c, 530 d may include a 3-1 recess 530 a, a 3-2 recess530 b, a 3-3 recess 530 c, and a 3-4 recess 530 d.

The 1-1 recess 310 a and the 1-2 recess 310 b of the second printedcircuit board 300 may be disposed so as to be connected respectively tothe 3-1 recess 530 a and the 3-2 recess 530 b of the support unit 500,and the first fixing unit 610 may extend through the 3-1 recess 530 aand the 1-1 recess 310 a and through the 3-2 recess 530 b and the 1-2recess 310 b.

In addition, a first protruding portion 611, which contacts acorresponding one of the 1-1 recess 310 a and the 1-2 recess 310 b ofthe second printed circuit board 300, may be disposed on one end of thefirst fixing unit 610, and a first screw thread 612, which isscrew-engaged into a corresponding one of the second coupling recesses130 of the housing 100, may be disposed on the other end of the firstfixing unit 610.

The first fixing unit 610 is coupled into each of the second couplingrecesses 130 through the first screw thread 612, and at the same time,the first protruding portions 611 are disposed on the second printedcircuit board 300, whereby the first fixing unit 610 may fix the secondprinted circuit board 300 to the first location portion 510 of thesupport unit 500.

Meanwhile, fitting recesses 420 may be disposed in the edge of the thirdprinted circuit board 400 that contacts the support unit 500. Inaddition, fitting protrusions 560 corresponding to the fitting recesses420 may be disposed in the support unit 500. The height of each of thefitting protrusions 560 may be set so as to be equal to the thickness ofthe third printed circuit board 400.

The fitting protrusions 560 may be coupled into the fitting recesses 420such that the third printed circuit board 400 is fixed to the supportunit 500.

In this embodiment, a pair of fitting recesses 420 is formed in each ofopposite edge portions of the third printed circuit board 400 such thatfitting protrusions 560 of the support unit 500 can be inserted into thefitting recesses 420. However, the structure by which the third printedcircuit board 400 is disposed and fixed to the support unit 500 is notlimited thereto.

In addition, the 2-1 recess 410 a and the 2-2 recess 410 b of the thirdprinted circuit board 400 may be disposed so as to be connectedrespectively to the 3-3 recess 530 c and the 3-4 recess 530 d of thesupport unit 500, and the second fixing unit 620 may extend through the3-3 recess 530 c and the 2-1 recess 410 a and through the 3-4 recess 530d and the 2-2 recess 410 b.

In addition, a second protruding portion 621, which contacts acorresponding one of the 2-1 recess 410 a and the 2-2 recess 410 b ofthe third printed circuit board 400, may be disposed on one end of thesecond fixing unit 620, and a second screw thread 622, which isscrew-engaged into a corresponding one of the second coupling recesses130 of the housing 100, may be disposed on the other end of the secondfixing unit 620.

The second fixing unit 620 is coupled into each of the second couplingrecesses 130 through the second screw thread 622, and at the same timethe second protruding portions 621 are disposed on the third printedcircuit board 400, whereby the second fixing unit 620 may fix the thirdprinted circuit board 400 to the second location portion 520 of thesupport unit 500.

Meanwhile, one side of the edge of the first printed circuit board 200and one side of the edge of the second printed circuit board 300 may beconnected to each other via a first flexible printed circuit board(FPCB) 250, and the other side of the edge of the second printed circuitboard 300 and the other side of the edge of the third printed circuitboard 400 may be connected to each other via a second flexible printedcircuit board (FPCB) 350

When a plurality of printed circuit boards is disposed above a firstprinted circuit board having an image sensor mounted thereon, asdescribed above, the first printed circuit board is configured to besmaller than the plurality of printed circuit boards. Consequently, asupport unit, in which the plurality of printed circuit boards is spacedapart from each other in the vertical direction, is disposed in ahousing so as to receive the first printed circuit board. As a result,the plurality of printed circuit boards may be disposed above the firstprinted circuit board without direct connection with the first printedcircuit board. Consequently, the printed circuit boards may not bephysically stressed, whereby the printed circuit board having the imagesensor mounted thereon is not deformed or dislocated, and therefore itis possible to acquire a captured image without distortion.

Although embodiments have been described with reference to a number ofillustrative embodiments thereof, it should be understood that theembodiments are illustrative and not restrictive, and that numerousother modifications and applications may be devised by those skilled inthe art that will fall within the intrinsic aspects of the embodiments.For example, various variations and modifications are possible inconcrete constituent elements of the embodiments. In addition, it is tobe understood that differences relevant to such variations andmodifications fall within the spirit and scope of the presentdisclosure, which is defined in the appended claims.

MODE FOR INVENTION

Various embodiments have been described in the best mode for carryingout the invention.

INDUSTRIAL APPLICABILITY

A camera module, configured such that printed circuit boards are notphysically stressed, whereby a printed circuit board having an imagesensor mounted thereon is not deformed or dislocated, thus making itpossible to acquire a captured image in a vivid state withoutdistortion, may be used in various fields, such as those of vehiclecameras and mobile cameras.

The invention claimed is:
 1. A camera module comprising: a housing including an adhesion surface; a lens barrel disposed in the housing; a first printed circuit board disposed on the housing; an adhesion member disposed between the adhesion surface and the first printed circuit board; a second printed circuit board disposed on the first printed circuit board; a first flexible printed circuit board connecting the first printed circuit board with the second printed circuit board; and a fixing unit coupled to the housing through the second printed circuit board, wherein the second printed circuit board is coupled to the housing by the fixing unit, wherein the first printed circuit board comprises a first groove at a first corner of the first printed circuit board and a second groove at a second corner of the first printed circuit board, and wherein the fixing unit comprises a first fixing unit disposed outside the first groove and a second fixing unit disposed outside the second groove.
 2. The camera module according to claim 1, wherein the first circuit board is physically spaced apart from the second printed circuit board, and wherein a sectional area of the first printed circuit board is smaller than a sectional area of the second printed circuit board.
 3. The camera module according to claim 1, wherein the first groove is disposed to surround a portion of the first fixing unit and the second groove is disposed to surround a portion of the second fixing unit.
 4. The camera module according to claim 1, wherein the first fixing unit and the second fixing unit are disposed diagonally from each other, and wherein the first fixing unit and the second fixing unit are disposed outside the adhesion surface.
 5. The camera module according to claim 1, wherein the housing includes a first hole disposed at a first corner of the housing and a second hole disposed at a second corner of the housing opposite from the first corner of the housing, wherein the adhesion surface comprises a first curved part adjacent to the first corner of the housing and a second curved part adjacent to the second corner of the housing, and wherein a portion of the first curved part has a shape corresponding to the first groove, and a portion of the second curved part has a shape corresponding to the second groove.
 6. The camera module according to claim 5, wherein the fixing unit is spaced apart from the first printed circuit board, and wherein a portion of the first fixing unit is disposed in the first hole and a portion of the second fixing unit is disposed in the second hole.
 7. The camera module according to claim 1, wherein a shape of the adhesion surface corresponds to a shape of an outer perimeter of a first surface of the first printed circuit board, wherein the adhesion member contacts the adhesion surface and the outer perimeter of the first surface of the first printed circuit board, and wherein an image sensor is disposed on the first surface of the first printed circuit board.
 8. The camera module according to claim 7, wherein the first surface of the first circuit board faces the lens barrel and the adhesion surface, and wherein the adhesion surface comprises a plurality of concave portions and a plurality of convex portions relative to the outer perimeter of the first surface of the first printed circuit board.
 9. The camera module according to claim 8, wherein the first circuit board comprises a second surface facing the second circuit board, the second surface of the first circuit board being opposite from the first surface of the first circuit board, and wherein the second surface of the first printed circuit board is spaced apart from the second printed circuit board in a direction parallel to an optical axis of the lens barrel.
 10. A camera module comprising: a housing comprising an adhesion surface; a lens barrel disposed in the housing; a first printed circuit board disposed on the housing; an adhesion member disposed between the adhesion surface and the first printed circuit board; a second printed circuit board disposed on the first printed circuit board; and a first flexible printed circuit board connecting the first printed circuit board with the second printed circuit board; and a fixing unit comprising a first fixing unit and a second fixing unit coupled to the housing through the second printed circuit board, wherein the first fixing unit and the second fixing unit are disposed diagonally from each other, and wherein the first fixing unit and the second fixing unit are disposed outside the adhesion surface and the first printed circuit board.
 11. The camera module according to claim 10, wherein the fixing unit is spaced apart from the first printed circuit board.
 12. The camera module according to claim 10, wherein the adhesion surface comprises a plurality of concave portions and a plurality of convex portions relative to an outer perimeter of a first surface of the first printed circuit board.
 13. The camera module according to claim 10, wherein a sectional area of the first printed circuit board is smaller than a sectional area of the second printed circuit board, and wherein an image sensor is disposed on the first printed circuit board.
 14. The camera module according to claim 10, wherein the housing comprises a first hole disposed at a first corner of the housing and a second hole disposed at a second corner of the housing opposite from the first corner of the housing, wherein the adhesion surface comprises a first curved part adjacent to the first corner of the housing and a second curved part adjacent to the second corner of the housing, and wherein a portion of the first fixing unit is disposed in the first hole and a portion of the second fixing unit is disposed in the second hole.
 15. The camera module according to claim 14, wherein the first circuit board comprises a first surface facing the adhesion surface and a second surface facing the second circuit board, the second surface of the first circuit board being opposite from the first surface of the first circuit board, wherein the first printed circuit board has a first groove at a first corner thereof adjacent to the first corner of the housing and a second groove at a second corner thereof adjacent to the second corner of the housing, and wherein a portion of the first groove has a shape corresponding to the first curved part of the adhesion surface of the housing, and a portion of the second groove has a shape corresponding to the second curved part of the adhesion surface of the second housing.
 16. A camera module comprising: a housing comprising an adhesion surface; a lens barrel disposed in the housing; a first printed circuit board disposed on the housing; an adhesion member disposed between the adhesion surface and the first printed circuit board; a second printed circuit board disposed on the first printed circuit board; a first flexible printed circuit board connecting the first printed circuit board with the second printed circuit board; and a fixing unit that penetrates the second printed circuit board and is coupled to the housing, wherein at least two corners of the adhesion surface are recessed inwardly, and wherein the adhesion surface comprises a plurality of concave portions and a plurality of convex portions.
 17. The camera module according to claim 16, wherein the first printed circuit board comprises a first groove at a first corner of the first printed circuit board and a second groove at a second corner of the first printed circuit board, and wherein the fixing unit comprises a first fixing unit disposed in an area corresponding to the first groove and a second fixing unit disposed in an area corresponding to the second groove.
 18. The camera module according to claim 16, wherein the first circuit board is spaced apart from the second printed circuit board, and wherein a sectional area of the first printed circuit board is smaller than a sectional area of the second printed circuit board, and wherein an image sensor is disposed on the first printed circuit board.
 19. The camera module according to claim 17, wherein the first fixing unit and the second fixing unit are disposed diagonally from each other, and wherein the first fixing unit and the second fixing unit are disposed outside the adhesion surface and the first printed circuit board.
 20. The camera module according to claim 17, wherein the housing comprises a first hole disposed at a first corner of the housing and a second hole disposed at a second corner of the housing opposite from the first corner of the housing, wherein the adhesion surface comprises a first curved part adjacent to the first corner of the housing and a second curved part adjacent to the second corner of the housing, and wherein a portion of the first curved part has a shape corresponding to the first groove and a portion of the second curved part has a shape corresponding to the second groove. 